To fix Gmail 500 error, you are supposed to follow and apply a few important steps and instructions. To do it, you are expected to check that you are using a browser that works with Gmail. Now, you must learn about Gmail-supported browsers. Now, you should check your browser extensions or applications. Now, you must clear the browser's cache and cookies, and then you should check your Gmail advanced settings. By applying or executing the steps, you can simply fix it.